Yep - it helps I’m on a electricity tariff with a cheap overnight rate (Octopus Go), so when there is no solar (E.g. November to March) I can still run the house on cheap energy (7.5p vs 30p+) by charging the battery and using that energy.5-6 years. Really. That's is way above average BTW if it's even true. https://www.moneysavingexpert.com/utilities/free-solar-panels/
Also some excess solar between April to October charging my car.
So in my scenario solar & battery will be saving me about £200 per month.
[Plus the benefit of running A/C for free during the summer]
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